Combeite Mineral Data

General Combeite Information
Help on Chemical Formula: Chemical Formula: Na2Ca2Si3O9
Help on Composition: Composition: Molecular Weight = 354.39 gm
   Sodium   12.97 %  Na   17.49 % Na2O
   Calcium  22.62 %  Ca   31.65 % CaO
   Silicon  23.78 %  Si   50.86 % SiO2
   Oxygen   40.63 %  O
           ______        ______ 
           100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na2Ca2Si3O9
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1957
Help on Locality: Locality: Link to MinDat.org Location Data.
 

Combeite Image

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Combeite

Comments: Crystalline cleavage fragment of combeite.
Location: Mont Saint Hilaire, Quebec, Canada. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Combeite Crystallography
Help on Axial Ratios: Axial Ratios: a:c = 1:1.25839
Help on Cell Dimensions: Cell Dimensions: a = 10.48, c = 13.188, Z = 6; V = 1,254.39 Den(Calc)= 2.81
Help on Crystal System: Crystal System: Trigonal - TrapezohedralH-M Symbol (3 2) Space Group: P 3221,P 3121
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.657(1), 2.607(0.8), 3.304(0.7),
Click Here for Large Combeite Structure Window Crystal Structure:

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Ohsato H , Maki I , Takeuchi Y , Acta Crystallographica, Section C , 41 (1985) p.1575-1577, Structure of Na2CaSi2O6, Locality: synthetic high-temperature form

View Additional jPOWD Structure files for Combeite
[1] [2] [3]
 

Physical Properties of Combeite

Help on Cleavage: Cleavage: None
Help on Color: Color: Colorless.
Help on Density: Density: 2.844
Help on Diaphaniety: Diaphaniety: Transparent
Help on Streak: Streak: white
 

Optical Properties of Combeite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.023 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.036 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2128,KPDmeas= 0.2103,KC= 0.2055
Help on Optical Data: Optical Data: Uniaxial (+), w=1.598, e=1.598, bire=0.0000.
 

Calculated Properties of Combeite

Help on Electron Density: Electron Density:

relectron=2.82 gm/cc
note: rCombeite =2.84 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.0116
Boson Index = 0.9884
Help on Photoelectric: Photoelectric:

PECombeite = 3.90 barns/electron
U=PECombeite x relectron= 11.01 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Combeite is Not Radioactive
 

Combeite Classification
Help on Dana Class: Dana Class: 61.1.2a.5 (61)Cyclosilicate Six-Membered Rings
  (61.1)with [Si6O18] rings; possible (OH) and Al substitution
  (61.1.2a)Lovozerite group (HEX and HEX-R subgroup)
 
61.1.2a.1 Lovozerite H4Na2Ca(Zr,Ti)[Si6O18] R 3m 3 2/m
 
61.1.2a.2 Kazakovite Na6MnTiSi6O18 R 3m 3 2/m
 
61.1.2a.3 Tisinalite Na3H3(Mn,Ca,Fe)TiSi6(O,OH)18·2(H2O) R 3m 3 2/m
 
61.1.2a.4 Zirsinalite Na6(Ca,Mn,Fe)Zr[Si6O18] R 3m 3 2/m
 
61.1.2a.5 Combeite Na2Ca2Si3O9 P 3221,P 3121 3 2
 
61.1.2a.6 Kapustinite! Na5.5Mn0.25ZrSi6O16(OH)2 C 2/m 2/m
Help on Strunz Class: Strunz Class: VIII/E.15-10 VIII - Silicates
  VIII/E - Cyklosilicates, six rings [Si6O18]12-
  VIII/E.15 - Combeite - Kostylevite series
 
VIII/E.15-10 Combeite Na2Ca2Si3O9 P 3221,P 3121 3 2
 
VIII/E.15-30 Kostylevite K2ZrSi3O9·(H2O) P 21/a 2/m
 

Other Combeite Information
Help on References: References: PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Combeite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (MinSocAm) 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 - WWW-MINCRYST 14 -École des Mines de Paris

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Combeite

Na2Ca2Si3O9
Dana No: 61.1.2a.5 Strunz No: VIII/E.15-10
Locality:

 

Notes:

 
 
   
 
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